If the patellar tendon hurts during training, it doesn’t really matter (unless it is excruciating).

What matters is pain the next day. If there is more pain 24 hours later, this is the sign that yesterday’s loading was too much for the tendon to handle and you need to scale back.

Podcast with Jason Eure: https://jackedathlete.com/podcast25...

Paper addressing patellar tendon pain and exercise (Patellar Tendinopathy: Clinical Diagnosis, Load Management, and Advice for Challenging Case Presentations): https://www.jospt.org/doi/10.2519/jos...

The Scientific Framework behind Jumper's Knee: https://jackedathlete.com/jumpersknee...

The best Patellar Tendon Training Program in existence: https://jackedathlete.com/jumpersknee...